DNA From Phony 'Chewing Gum Survey' Solves 1976 Cold Case

A DNA sample from a phony "chewing gum survey" led to the arrest of a man who has been charged with killing a 70-year-old woman in 1976, making this the oldest cold case to ever be cracked in Maine.

Gary Sanford Raub, 63, was arrested on Monday in Seattle and charged with murdering 70-year-old Blanche Kimball in Augusta, Maine.

Kimball was found stabbed to death inside her State Street home on June 12, 1976 after neighbors called police to say they had not seen her for several days. The killer eluded investigators and the case turned cold, but authorities kept at it over the decades.

"In Maine, State Police assign the open homicide cases to a detective. There's always a detective assigned to these cases, which are constantly reviewed, as time permits," Maine State Police spokesman Steve McCausland told ABCNews.com.

Recent DNA work by the State Police Crime Lab on evidence from the crime led them to Raub, authorities said.

"It was last summer that we got some very concrete DNA work on some of the evidence that was seized and made a comparison that brought us to this point," McCausland said. "It was DNA that cracked this."

Raub was tracked to Seattle, where he was living as a homeless transient and police knew him from his lengthy criminal record. Authorities discovered that Raub knew Kimball and had at one time lived at her home.

Augusta investigators coordinated with authorities in Seattle and used a fake "gum chewing survey" to get a new DNA sample from Raub.

"I don't know the exact details, but we obviously needed some up-to-date DNA from him and some bubble gum was the key to getting that," McCausland said.

Three decades later, investigators remained committed to finding justice for Kimball.

"Even though all of her relatives are gone--her house has even been torn down--we continued to work on her behalf and obviously are pleased it's arrived to this point," McCausland said. "This is the oldest cold case cracked in Maine, so there's great satisfaction here."

Two detectives from Maine flew to Seattle on Monday and made the arrest with assistance from Seattle police. Raub now faces a murder charge in Maine and is being held as a fugitive from justice in Washington. His first court appearance to begin his extradition process to return him to Maine is expected to take place this week.

Raub could face life in prison if convicted. Attempts to reach the suspect or his lawyer for comment weren't immediately successful.